aFe 50-74008 is the Momentum HD intake with one oiled Pro 10R 20-91059 filter for specified GM Silverado HD/Sierra HD 2017–2019 6.6L L5P Duramax diesel applications. Its exact shared manufacturer manual and current selected-part product page establish the hardware and application; dry-media rows identify a separate configuration.
Current exact primary page and shared manual specify 2017–2019 Silverado HD/Sierra HD L5P 6.6L turbo diesels. All original named groups, year bounds and gaps remain unchanged. Match actual engine generation, sensor provisions, turbo-inlet arrangement and airbox mounts. These HD trims also have gas-engine choices, which this diesel intake does not approve. Missing named groups and earlier trim endpoints remain follow-up holds until exact selected-part evidence resolves them; no broad manufacturer family is converted into new blanket trim rows. The manual explicitly includes Denali. Its resonator-removal branch is optional; the current page describes stock mechanical-fan fit.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2017-2019 | Chevrolet | Silverado 2500 HD | High Country |
| 2017-2019 | Chevrolet | Silverado 2500 HD | LT |
| 2017-2019 | Chevrolet | Silverado 2500 HD | LTZ |
| 2017-2019 | Chevrolet | Silverado 2500 HD | WT |
| 2017-2019 | Chevrolet | Silverado 3500 HD | High Country |
| 2017-2019 | Chevrolet | Silverado 3500 HD | LTZ |
| 2017-2019 | Chevrolet | Silverado 3500 HD | WT |
| 2017-2019 | GMC | Sierra 2500 HD | Base |
| 2017-2019 | GMC | Sierra 2500 HD | Denali |
| 2017-2019 | GMC | Sierra 2500 HD | SLE |
| 2017-2019 | GMC | Sierra 2500 HD | SLT |
| 2017-2019 | GMC | Sierra 3500 HD | Denali |
| 2017-2019 | GMC | Sierra 3500 HD | SLE |
| 2017-2019 | GMC | Sierra 3500 HD | SLT |
Verify 50-74008 against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 50-74008 |
| Product type | Momentum HD cold air intake |
| Selected filter | One 20-91059; ten-layer oiled cotton-media Pro 10R |
| Tube / housing / scoop | 05-74008B1 / 05-74008B2 / 05-74008B3 |
| Elbow | 05-01420, resonator-removal branch |
| T-bolt clamps | One each: 03-50267 8-5/16 to 8-5/8 inches; 03-50499 4-5/16 to 4-5/8; 03-50262 4-1/16 to 4-3/8 |
| Seal | 05-00072, 7/16-inch trim, 27 inches |
| Sensor screws | Two Torx M4 03-50491; this manual omits numeric length |
| Factory transfers | MAF with gasket, bottom retaining plug, scoop rubber seal and six original clips |
| Resonator | Optional removal; supplied elbow and two smaller clamps apply to that branch |
| Torque / recheck | No numeric torque; check bolts, clamps and connectors after 200 miles |
| UPC | 802959542934 |
| WARNING | This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov. |
| Quantity | Manufacturer service part | Component |
|---|---|---|
| 1 | 20-91059 | Selected Pro 10R filter; alternate dry row is not additional |
| 1 | 05-74008B1 | Tube |
| 1 | 05-74008B2 | Housing |
| 1 | 05-74008B3 | Scoop |
| 1 | 03-50267 | Large T-bolt, 8-5/16 to 8-5/8 inches |
| 1 | 05-01420 | Silicone elbow |
| 1 | 03-50499 | T-bolt, 4-5/16 to 4-5/8 inches |
| 1 | 05-00072 | 7/16-inch seal trim, 27 inches |
| 2 | 03-50491 | Torx M4 screws; length not specified here |
| 1 | 03-50262 | T-bolt, 4-1/16 to 4-3/8 inches |
The exact shared manual lists Pro 10R and Pro DRY S alternatives; this listing supplies one Pro 10R 20-91059 filter. The current exact kit page calls the filter ten-layer oiled media; the historical manufacturer guide labels the same oiled service number Pro 5R, so that legacy label is not substituted for current selected-media identification. The kit page reports 99.59-percent cumulative efficiency while the exact current service-filter page reports 99.47 percent. Test protocol and boxed revision are unresolved, so neither percentage is certified here as a single guaranteed efficiency. The service-filter headline rounds base/top to 8 inches while detailed text gives 8-1/8 inches, with 6-inch flange and 9-inch height. The 1,000-CFM filter-family claim is separate from whole-system bench flow and must retain its test basis. Maintenance supplies and alternate filters are separate. Transfer the original rubber scoop seal using all six original clips and transfer the bottom retaining plug. The current overview mentions a urethane auxiliary plug, but the exact L5P BOM does not list an extra auxiliary plug; this package-content conflict remains qualified. Its two M4 screws have no numeric length in this exact manual. Do not borrow later or earlier sensor screws.
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
One 20-91059 Pro 10R oiled filter. The dry row in the shared manual is an alternative, not another included filter.
Can this be used on every GM HD engine?No. Verify the exact L5P 6.6L diesel, model year, sensor arrangement and inlet hardware. Gas engines and other diesel generations are not inferred.
Which filter-media description applies?The current exact kit and service-filter pages identify ten-layer Pro 10R. The historical guide’s Pro 5R label for the oiled service number is retained as a source conflict, not substituted.
Is resonator removal mandatory?No. The exact manual makes removal optional; the supplied elbow and its two smaller clamps apply if the resonator is removed.
Which scoop parts transfer?Move the original rubber seal and all six clips to the supplied scoop. The bottom retaining plug transfers separately to the housing.
Are a new auxiliary plug and screw length established?The exact BOM does not list an additional auxiliary plug and names M4 screws without a numeric length. Do not borrow those details from another kit.
Is a single efficiency percentage established?No. Current kit text says 99.59 percent while exact service-filter text says 99.47 percent. Test and revision details remain unresolved, so neither is presented as a guaranteed single figure.
What torque and recheck interval apply?No numeric torque is stated. Recheck after 200 miles using the selected manual.
Verify aFe 50-74008. Use a cool engine and disconnect the negative battery as directed. Disconnect MAF and its harness clip, loosen the original intake clamps and remove the intake tube. Resonator removal is optional: for that branch, loosen its turbo-inlet clamp, remove its mounting nut and remove the resonator with the stock coupler. Release the coolant-line support clip without opening the circuit, then lift out the factory airbox. Transfer its rubber scoop seal using all six original clips; transfer the bottom retaining plug and install the supplied 27-inch seal trim. Loosely seat the selected filter and large clamp in the new housing, then firmly seat the assembly in factory grommets. Transfer MAF with its original gasket using the two supplied M4 screws. If the resonator was removed, install the supplied silicone elbow with the two appropriate smaller T-bolt clamps. Slide the tube into the filter and then into the coupler, align and secure the clamps. Fit the scoop with its transferred rubber seal and reconnect MAF. Check all bolts, clamps and connectors after 200 miles. No numeric torque or screw length is stated in this manual.
The current exact page advertises up to 70-percent flow and 15 hp/37 lb-ft. Its labeled media comparison at 7 inches H2O shows Pro 10R 705 versus stock 415 CFM, about 69.9 percent; the separate dry bar is 690 and is not this selected filter. The linked 2017 L5P family dyno marks 326.65 versus 312.12 hp, a 14.53 hp point difference, and 821.94 versus 785.37 lb-ft, a 36.57 lb-ft point difference. Independent peaks differ by only 2.56 hp (414.76 versus 412.20) and 17.53 lb-ft (821.94 versus 804.41). Both runs use stock exhaust and 40-percent load. Baseline April 10, 2017 conditions are 66.08°F/29.39 in-Hg/30% humidity/SAE 0.99; intake April 11 is 72.91°F/29.37/20%/SAE 1.00. Fan descriptions differ; the intake run additionally states stock wheels and fourth gear. The graph does not separately label every media configuration, and differences in conditions and point-versus-peak results prevent a guaranteed result. The current selected-part page is not CARB exempt and restricts California purchase/use on California-registered vehicles; the exact manual also prohibits regulated California public-road use. The historical guide’s pending status is not an exemption.
California Proposition 65 warning: this product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.
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